Common MTU sizes | NETGEAR DGND4000-100NAS specification

N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000

•You have problems connecting to your ISP or other Internet service, and the technical support of either the ISP or NETGEAR recommends changing the MTU setting. These web-based applications might require an MTU change:

-A secure website that does not open, or displays only part of a web page

-Yahoo email

-MSN portal

-America Online’s DSL service

•You use VPN and have severe performance problems.

•You used a program to optimize MTU for performance reasons, and now you have connectivity or performance problems.

Note: An incorrect MTU setting can cause Internet communication problems such as the inability to access certain websites, frames within websites, secure login pages, or FTP or POP servers.

If you suspect an MTU problem, a common solution is to change the MTU to 1400. If you are willing to experiment, you can gradually reduce the MTU from the maximum value of 1500 until the problem goes away. The following table describes common MTU sizes and applications.

Table 11. Common MTU sizes

MTU	Application

1500	The largest Ethernet packet size and the default value. This is the typical setting for
	non-PPPoE, non-VPN connections, and is the default value for NETGEAR wireless
	modem routers, adapters, and switches.

1492	Used in PPPoE environments.

1472	Maximum size to use for pinging. (Larger packets are fragmented.)

1468	Used in some DHCP environments.

1460	Usable by AOL if you do not have large email attachments, for example.

1436	Used in PPTP environments or with VPN.

1400	Maximum size for AOL DSL.

576	Typical value to connect to dial-up ISPs.

To change the MTU size:

1.Select ADVANCED > Setup > WAN Setup.

2.In the MTU Size field, enter a new size from 64 through 1500.

3.Click Apply to save the settings.

NETGEAR genie ADVANCED Home

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NETGEAR DGND4000-100NAS user manual  To change the MTU size Select Advanced Setup WAN Setup, Common MTU sizes

Contents

USA Support Trademarks Contents USB Printer Control Administration Appendix a Supplemental Information Hardware Setup Product Specifications Unpack Your New Router N750 Wireless Dual Band Gigabit Adsl Modem Router DGND4000 Box contents Hardware Setup Unpack Your New Router Hardware Features Label Back Panel Back panel port connections Front Panel Front panel LEDs Wireless button GHz Wireless LED Position Your Wireless Router Power On/Off LED Adsl Microfilters One-Line Adsl Microfilter Not Included Two-Line Adsl Microfilter Included Cable Your N750 Wireless Modem RouterSummary Verify the Cabling Connect to Internet with Adsl or Ethernet WAN Get Started with Netgear genie Prepare to Set Up the Wireless Modem Router Types of Logins and AccessWireless Devices and Security Settings Use Standard TCP/IP Properties for Dhcp Netgear genie Setup  To use Netgear genie to set up your wireless modem routerBrowse to http//routerlogin.net  If the browser cannot display the web Use Netgear genie after Installation Upgrade Wireless Modem Router Firmware Wireless Modem Router Dashboard Basic Home Screen Add Wireless Devices or Computers to Your Network Wi-Fi Protected Setup WPS Method To use WPS to join the wireless network Manual Method N750 Wireless Dual Band Gigabit Adsl Modem Router DGND4000 Netgear genie Basic Settings Internet Basic Settings Screen Fields Internet Basic SettingsDoes Your ISP Require a Login? Answer either yes or no Internet IP Address Attached Devices Parental Controls USB Storage Basic Settings ReadySHARE USB Storage and Printer Basic Wireless Settings ReadySHARE Printer  To view or change basic wireless settings Wireless Settings Screen Fields Wireless Network Security Options Settings Change WPA Security Option and Passphrase  To set up a guest network Guest Networks Guest Network Wireless Security Options Netgear genie App  To install the genie mobile app Netgear genie Mobile App Netgear genie Advanced Home Setup Wizard N750 Wireless Dual Band Gigabit Adsl Modem Router DGND4000  To use the WPS Wizard WPS WizardSelect either Push Button or PIN Number VPN Wizard  To use the VPN Wizard N750 Wireless Dual Band Gigabit Adsl Modem Router DGND4000 Setup Menu Adsl Setup WAN Setup  To set up a default DMZ server Default DMZ ServerChange the MTU Size  To change the MTU size Select Advanced Setup WAN Setup Common MTU sizes LAN Setup  To change the LAN settings LAN Setup Screen Settings Use the Wireless Modem Router as a Dhcp ServerLAN TCP/IP Setup Use Router as a Dhcp Server Address Reservation  To reserve an IP address Quality of Service Setup Enable WMM QoS for Wireless Multimedia Applications QoS for Applications and Online Gaming Set Up QoS for Internet Access To create a QoS policy for applications and online games N750 Wireless Dual Band Gigabit Adsl Modem Router DGND4000 QoS for a Wireless Modem Router LAN Port QoS for a MAC AddressClick the Add Priority Rule button Click Add Priority Rule Edit or Delete an Existing QoS Policy  To edit or delete a QoS policy USB Storage ReadySHARE Access USB Drive Requirements File-Sharing Scenarios Share PhotosStore Files in a Central Location for Printing  To share files with your friends and family USB Storage Basic Settings Share Large Files over the Internet  To access your USB device Add or Edit a Network Folder USB Storage Advanced Settings Safely Remove a USB Drive Available Network Folders Media Server Settings Specify Approved USB Devices Connect to the USB Drive from a Remote Computer Select the Allow only approved devices check box ReadySHARE Cloud USB Printer Control USB Printer Control Control Center Configuration USB Printer Scan with a Multifunction Printer Security  To delete a keyword or domain Keyword Blocking of Http Traffic To specify a trusted computer Firewall Rules  To create firewall rules N750 Wireless Dual Band Gigabit Adsl Modem Router DGND4000 Add Custom Services to Allow or Block  To add a custom service TCP UDP TCP/UDP Schedule for Firewall Rules  To specify the firewall rule schedule  To set up email notifications Security Event Email Notifications Administration Upgrade the Wireless Modem Router Firmware Router Information View Wireless Modem Router StatusInternet Port Show Statistics Button System up time and poll interval statistics Wireless Settings 2.4 GHz and 5 GHz Connection Status Button Guest Network 2.4 GHz and 5 GHz View Logs of Web Access or Attempted Web Access View VPN Status Manage the Configuration File Back Up Settings Restore Configuration Settings To restore configuration settings that you backed up Do not interrupt the reboot process Set Password Password Recovery Diagnostics N750 Wireless Dual Band Gigabit Adsl Modem Router DGND4000  To set up Time Machine Set Up Time MachineTime Machine Access the Connected USB Hard Drive  To access the drive Time Machine Before You Back Up a Large Amount of Data 101 Select Guid Partition Table or Master Boot Record MBR Change the Partition Scheme Advanced Settings Fine -tuning your network Advanced Wireless Settings 105 106 Wireless Repeating Function WDS Wireless repeating scenario Wireless Repeating Function Set Up the Base Station  To set up the base station Set Up a Repeater Unit  To configure the wireless modem router as a repeater unit Remote Computer Access Basics Port Forwarding and Triggering Port Triggering to Open Incoming Ports 113 Port Forwarding to Permit External Host Communications  To set up port forwarding Set Up Port Forwarding to Local ServersHow Port Forwarding Differs from Port Triggering 116 Click Edit Service or Delete Service Add a Custom ServiceEdit or Delete a Port Forwarding Entry Application Example Making a Local Web Server Public Set Up Port Triggering To make a local web server public 119 Dynamic DNS Select the Use a Dynamic DNS Service check box  To set up Dynamic DNSStatic Routes 122  To set up a static route Remote Management USB Settings Universal Plug and Play  To turn on Universal Plug and Play IPv6  To set up an IPv6 Internet connection typeTraffic Meter 128  To set up ReadySHARE Cloud Click Register 130 Device Mode VPN Policies 132 Add or Edit an Auto VPN Policy  To add or edit an Auto VPN Policy IKE Fully Qualified Domain Name. Your domain name Parameters Add or Edit a Manual VPN Policy  To add or edit a Manual VPN policy 137 Troubleshooting Wireless Settings Network SettingsQuick Tips Sequence to Restart Your Network Power LED Stays Red Power LED Is Off or BlinkingTroubleshoot with the LEDs Wireless LEDs Are Off LEDs Never Turn OffInternet or Ethernet Port LEDs Are Off Push N Connect WPS Button Blinks Green Cannot Log In to the Router Cannot Access the Internet To check the WAN IP address Select Administration Router Status Troubleshoot Internet Browsing Troubleshoot PPPoE To troubleshoot a PPPoE connection Changes Not Saved Wireless ConnectivityIncorrect Date or Time Troubleshoot Your Network Using the Ping Utility Restore the Factory Settings and PasswordWireless Signal Strength Test the LAN Path to Your Router Test the Path from Your Computer to a Remote Device 148 Factory Settings Supplemental Information 150 Technical Specifications DGND4000 Router specifications Regulatory Compliance Information Netgear Dual Band WirelessEurope EU Declaration of Conformity 153 FCC Requirements for Operation in the United States FCC Caution Important Note Radiation Exposure Statement Industry CanadaAvertissement Interference Reduction Table Index 158 159 160